Double pipe-coil.



PATENTED'JUNE 13, 1905.

S. THURSTENSEN.

DOUBLE PIPE COIL.

APPLICATION FILED FEB.13.1905.

2 SHEETS-SHEET 1 a? Will l mi Hill 2 SHEETS-SHEET 2.

U ItOT I n I S. THURSTENSEN.

DOUBLE PIPE COIL.

APPLICATION FILED r-EB.13.1905.

UNITED STATES Patented June 13, 1905.

PATENT I OFFICE.

SOREN THURSTENSEN, OF LOUISVILLE, KENTUCKY, ASSIGNOR TO HENRY VOGT MACHINE COMPANY, OF LOUISVILLE, KENTUCKY.

DOUBLE PIPE-COIL.

SPECIFICATION forming part of Letters Patent No. 792,295, dated June 13, 1905.

Application filed February 13, 1905. Serial No. 245,509.

To all whom it may concern:

Be it known that I, SoREN THURSTENSEN, a citizen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented certain new and useful Improvements in Double Pipe-Coils, of which the following is a specification. I

This invention relates to that class of coils which consist of inner and outer pipes and are used in condensers, brine-coolers, exchangers, and similar mechanism; and the object of the present invention is to simplify the construction of the coil as a whole and enable the parts to be more readily and quickly assembled. Another object of the invention is to provide for the unequal expansion and contraction of the inner and outer pipes and at the same time to preserve a seal to prevent leakage at the joints.

Another object of the invention is to reduce the number of stuffing-boxes required to preserve the sealing between the. pipes without impairing the operation of the coil as a whole and at the same time provide a requisite number of stuffing-boxes to allow of the necessary expansion and contraction and to provide the necessary means for regulating the degree of pressure exerted by the packing.

The invention consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings illustrating the invention, Figure 1 is a side elevation of a completecoil embodying the features of the present invention; Fig. 2, a sectional detail of the fittings employed in a coil as used in ammonia-condensers.

The coil consists of a series of exterior pipes 1 of any suitable number, and interior pipes 2, passing through the exterior pipes, each of the exterior pipes being screw-threaded at one end into a header 3,provided with two screw-threaded openings 4 and a crosspassage 5 on its interior for establishing communication between the two exterior pipes. The opposite end of the exterior pipes is screw-threaded into a header 6, which consists of two sections 7, which are joined together by a dovetail or similar joint and are provided with openings 8 in alinement with the openings 4 and adapted to have the ends of the pipes screw-threaded thereinto. The two sections of the header 6 when united together provide a chamber-passage 8, similar in shape and function to the passage 5 in the companion header, so that when the parts are assembled, as shown in Fig. 2, a complete circulation may be established through the exterior pipes and headers. The two sections of the header 6 are secured together bymeans of cross-b olts 9, which may be regulated to exert any suitable degree of pressure to lock the sections together. The headers 3 and 6 are each provided with exterior walls 10 and 11, respectively, through which are bored openings 12 and 13, respectively, ofless diameter than the openings for the exterior pipes or tubes, and the header 6 is provided with stuffing-boxes 14, surrounding the openings 13, into which stufling-boxes are entered glands 15, which are adapted to be regulated by means of screw-bolts 16 to compress a packing 17, which bears against the inner tubes and seals'the same and at the same time allows the necessary movement due to expansion and contraction when in use.

The exterior wall 19 of the header 3 is provided with lugs or bosses 18, which surround the openings 12 and are adapted to enter bores or recesses 19 in flanges 20, into the inner ends of which the ends of the inner tubes are screw-threaded, and within the bores or recesses 19 are located packing rings or gaskets 21, which serve to seal the joint at this point. The flanges are held in place by means of screw-bolts 22, which can be regulated to compress the gaskets to any desired degree. Into the outer ends of the flanges are entered the nipples 23 in alinement with the inner tubes, and said nipples are provided with flanges 24, which are engaged by couplingrin s 25, which are screw-threaded onto the ends of an elbowor return-bend 26, which connects the tubes. The opposite ends of the inner tubes 2 have screwthreaded thereonto flanged nipples 27, which are engaged by coupling-rings 28, screw-threaded into elbows or return-bends 29,forming the complete 0011, and it will be understood that all of the connections at one end of the coil of Fig. 1 are similar to that shown at the right in Fig. 2 and all of the connections at the opposite end of the complete coil of Fig. 1 are similar to that shown on the left of Fig. 2.

In the coil which is used for ammonia-condensers it is necessary that the joints should be firmly sealed, since any leakage, howsoever slight, will tend to impair the operation of the device, and the inner tube is screw-threaded into the recess 30, and at the same time a packing or gasket is provided in addition which forms, in efiiect, a regular male and female joint and guards against the possibility of leakage along the thread of the tube. By forming the header 6 in sections the parts may be readily assembled, since it will be possible to enter the outer tubes into the sectional header and then screw them each into the solid header, after which the inner tubes can be passed through the headers and the flanges 20 screwed thereonto and then the nipples of the return-bends entered into place and the coupling-rings screwed tight to bring the parts into firm contact with one another. The return-bends 29 are secured in place in any similar manner. This construction emloys stuffing-boxes at one end only, which is highly desirable for the reason that there is always danger of leakage through a stuflingbox, so that by reducing the number of stuffing-boxes to a minimum the liability of leakage is correspondingly decreased. At the same time sufficient provision must always be made for the expansion. and contraction of the tubes due to unequal temperatures, and for this purpose stuffing-boxes have been provided at one end.

It will be noted that the parts are so arranged that they may be assembled without difliculty, and this is a feature of great importance in the art to which the present inven tion relates, and at the same time the parts are so constructed that when assembled the coil as a whole will be strong and durable and capable of withstanding great strain and hard usage without the danger of impairment.

What I regard as new, and desire to secure by Letters Patent, is-

1. In a device of the class described, the combination of outer tubes, a header into which one end of the tubes is entered and secured, a com anion header consisting of sections in whic the opposite ends of the tubes are entered. and secured, inner tubes passing through the outer tubes and through the headers, stuffing-boxes formed in one only of the headers and adjustable glands acting in combination therewith, and return -bends connecting the ends of the inner tubes, substantially as described.

2. In a device of the class described, the combination of outer tubes, headers into which the ends of the outer tubes are entered and secured, one of the headers being formed in sections, stuffing-boxes formed in the sectional header, inner tubes passing through the outer tubes and both headers and outwardly projecting therefrom, glands surrounding the inner tubes and acting in combination with the stufiing-boxes, flanges entered onto the opposite ends of the inner tubes and forming in combination with the adja cent headers male and female joints, and return-bends connecting both ends of the inner tubes, substantially as described.

3. In a device of the class described, the combination of outer tubes, headers into which the ends of the outer tubes are entered and secured, one of the headers being formed in sections, stuffing-boxes formed in the sectional header, inner tubes passing through the outer tubes and both headers and outwardly projecting therefrom, glands surrounding the inner tubes and acting in combination with the stuihng-boxes, collars entered onto the opposite ends of the inner tubes and forming in combination with the adjacent headers male and female joints, re turn-bends at both ends of the inner tubes and coupling connections for securing the return-bends in place, substantially as described.

4. In a device of the class described, the combination of outer tubes, headers into which the ends of the outer tubes are screwthreaded, one of the headers being formed in sections and the other being formed integrally, inner tubes passing through the outer tubes and through both headers, stuliingboxes formed in the sectional header, adjustable glands cooperating therewith, collars screw-threaded on the ends of the inner tubes and forming in combination with the integral header male and female joints, nipples screw-threaded in the collars, a return-bend entered onto the nipples and coupling-nuts uniting the return-bend to the nipples, and a companion return-bend at the opposite ends of the inner tubes, substantially as described.

5. In a device of the class described, the combination of outer tubes, headers into which the ends of-the outer tubes are screwthreaded, one of the headers being formed in sections and the other being formed integrally, inner tubes passing through the outer tubes and through both headers, stuffing boxes formed in the sectional header, adjustable glands cooperating therewith, flanges screw-threaded on the ends of the inner tubes and forming in combination with the integral header male and female joints, nipples screw-threaded in the flanges, a return-bend.

IIO

entered onto the nipples and coupling-nuts uniting the return-bend to the nipples, a companion return-bend at the opposite ends of the inner tubes, and a coupling-ring connecting the return-bend directly onto the ends of the inner tubes, substantially as described.

6. In a device of the class described, the combination of outer tubes, headers into which the ends of the outer tubes are screwthreaded, one of the headers being formed integrally and the other header being formed in sections, cross-bolts securing the parts of the sectional header together, stuffing-boxes formed in the sectional header, inner tubes passing through the outer tubes and both eaders and outwardly projecting there- 

